Experimental and analytical framework for predicting nonlinear viscoelastic–viscoplastic behavior of polymers

Oseli, Alen (author), Šobak, Matic (author), Slemenik Perše, Lidija (author)

The present research addresses the modeling of viscoelastic–viscoplastic behavior of polymers with a theoretical expansion of Schapery’s nonlinear viscoelastic model by incorporating two components of irrecoverable processes, displaying material flow and viscoplastic behavior (structure- and load-related irrecoverable process). The theory is accompanied by an experimental and analytical framework for identifying model parameters. Introduced multi-scale analysis allows evaluation of pure linear and nonlinear viscoelastic, as well as viscoplastic behavior, enabling the study of their contribution to overall material response. Model performance was examined with creep recovery tests on two versa- tile and well-established thermoplastic polymers with different morphological structures: amorphous ABS exhibiting notable flow and semi-crystalline POM, where flow may be neglected. Results show extremely accurate predictions and exceptional agreement with experimental data, as the error was found to be less than 5% ranging from infinitesimally small to relatively high loading magnitudes (from 0.1 to 15 MPa of shear stress) at 70 ◦C (maximum operating temperature). Notably, viscoplastic strains were detected even within linear viscoelastic domain, suggesting that these effects are not related to yield phenomena (associated with progressive/damaging mechanisms), but rather provide an explanation for the material’s inability to fully recover. With its predictive capability and adaptability, the model demonstrates to be a powerful tool for capturing realistic material responses not only for the considered but also applicable to other molecular systems.

• Language: English
• Keywords: polymers, linear viscoelastic behavior, nonlinear viscoelastic behavior, viscoplastic behavior, Schapery’s nonlinear model
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2025
• Number of pages: 22 str.
• Numbering: Vol. 17, issue 23, art. 3095
• PID: 20.500.12556/RUL-176207
• UDC: 544.6.018.47-036.5
• ISSN on article: 2073-4360
• DOI: 10.3390/polym17233095
• COBISS.SI-ID: 258604547
• Publication date in RUL: 25.11.2025

Record is a part of a journal

• Title: Polymers
• Shortened title: Polymers
• Publisher: MDPI
• ISSN: 2073-4360
• COBISS.SI-ID: 517951257

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: polimeri, linearno viskoelastično vedenje, nelinearno viskoelastično vedenje, viskoplastično vedenje, Schapery’jev nelinearni model

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P2-0264-2020
• Name: Trajnostni Polimerni materiali in Tehnologije